.header{
  position: relative;
  width: 100%;
  height: 106px;
  background-color: #fff;
  overflow: hidden;
}
.header .logo{
  display: block;
  position: absolute;
  left: 40px;
  top: 24px;
  width: 90px;
  height: 60px; 
}
.header .logo .logo-img{
  width: 100%;
  height: 100%;
}
.header .header-c{
  width: 1200px;
  height: 100%;
  background-color: #fff;
  margin: 0 auto;
}
.header .header-c .nav{
  float: left;
  /* width: xx%; */
  height: 100%;
  font-size: 16px;
  color: #666;
}
.header .header-c .nav .nav-item{
  float: left;
  /* width: xxx */
  height: 100%;
  margin-right: 60px;
  line-height: 106px;
}
.header .header-c .nav .item-link{
  color: #666;
}
.header .header-c .nav .nav-item.active{
  font-size: 18px;
}
.header .header-c .nav .nav-item.active .item-link{
  color: #333;
}
.header .header-c .nav .item-link:hover{
  font-size: 18px;
}
.header .header-c .nav .item-link:hover .item-link{
  color: #333;
}
.header .search-user{
  position: relative;
  float: right;
  width: 580px;
  height: 100%;
}
.header .search-user .search-input{
  width: 340px;
  height: 48px;
  border: 1px solid rgba(189,189,189,1);
  border-radius: 27.5px;
  outline: none;
  text-indent: 2em;
  margin-top: 33px;
}
.header .search-user .user-block{
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
}
.header .search-user .user-block .icon{
  width: 22px;
  height: 22px;
  margin-top: 43px;
}
.header .search-user .user-block .margin-43{
  margin-left: 43px;
  margin-right: 43px;
}



/* 为了处理logo的问题 临时补充响应式的知识点 */
/* 如果媒体宽度最大是1200的时候 */
@media(max-width:1200px){
  .header .logo{
    display: none;
  }
}